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The GNU Coding Standards also define a set of standard configuration variables used during the build. Here are some:
CCC compiler command
CFLAGSC compiler flags
CXXC++ compiler command
CXXFLAGSC++ compiler flags
LDFLAGSlinker flags
CPPFLAGSC/C++ preprocessor flags
configure usually does a good job at setting appropriate
values for these variables, but there are cases where you may want to
override them. For instance you may have several versions of a
compiler installed and would like to use another one, you may have
header files installed outside the default search path of the
compiler, or even libraries out of the way of the linker.
Here is how one would call configure to force it to use
gcc-3 as C compiler, use header files from
~/usr/include when compiling, and libraries from
~/usr/lib when linking.
~/amhello-1.0 % ./configure --prefix ~/usr CC=gcc-3 \ CPPFLAGS=-I$HOME/usr/include LDFLAGS=-L$HOME/usr/lib
Again, a full list of these variables appears in the output of
./configure --help.